I solved the problem !
I simply made a Scandisk (on Vista's Disk Management, right clic on your Disk, Tools, Scandisk) with the automatic fix activated.

It takes something like 35 or 45 minutes to Scan it, and when I rebooted, the problem had been solved, and I also win some Free Space (I were near 99 Go before installing OS Selector, I am now near 114 Go after Scandisk).

Thank you for your support, I hope this solution will help some people